Hi
I'm a newbie to memory map, but keen to get to grips with it.
I would like to be able to enter a position as latitude/longitude, and have the map display that position.
Is this possible?

Sure:
Tap the New Mark (flag) button on the toolbar.
Tap the blue popup menu button next to the mark.
Edit mark.
Change the Lat/Long. (NB, you can use a "d" as a substitute for the degrees symbol, or if you have it set to use different position units, you can enter a grid location. That's under Settings > Units).
Tap "View Mark".
You can then tap the mark again and delete it.

Thanks for the help. It was using d for degrees that was the key to it.
My only beef now is the inability to copy a position from google earth, iPad version, and paste the position to MM.

Well, you can do that, too. The method for copying the lat,long from Google maps is a bit convoluted, but it works.

In the Maps app, tap the pin you want to copy, and tap the blue Info button. Then "Share". It creates an email with a Contact VCF file and a link to the google maps web page. Send the email to yourself, then open it an tap the link. This opens the map app again, but now the lat-long you want is in the Search control at the top right. Tap-and-hold, Select all, and Copy. Don't worry about selecting the extra stuff after the lat long.

Now the easy part. In Memory-Map, create a mark, edit, tap and hold the Position, Select All, Paste. View.

If you have any of the Lat-Long formats selected in Memory-Map, it is not fussy about whether you enter decimal degrees, degrees and minutes, or degrees minutes and seconds. It also ignores any extra text at the end of the position you enter.